refactor: flatten padelnomics/padelnomics/ → repo root

git mv all tracked files from the nested padelnomics/ workspace
directory to the git repo root. Merged .gitignore files.
No code changes — pure path rename.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

transform/sqlmesh_padelnomics/models/raw/raw_eurostat_population.sql

@@ -0,0 +1,64 @@
+-- Raw Eurostat Urban Audit city population (dataset: urb_cpop1).
+-- Source: data/landing/eurostat/{year}/{month}/urb_cpop1.json.gz
+-- Format: Eurostat JSON Statistics API (dimensions + flat value array).
+--
+-- The Eurostat JSON format encodes dimensions separately from values:
+--   dimension.cities.category.index  → maps city code to flat array position
+--   dimension.time.category.index    → maps year to flat array position
+--   values                           → flat object {position_str: value}
+--
+-- This model stores one row per (city_code, year) by computing positions.
+-- Reference: https://wikis.ec.europa.eu/display/EUROSTATHELP/API+Statistics
+
+MODEL (
+  name padelnomics.raw_eurostat_population,
+  kind FULL,
+  cron '@daily',
+  grain (city_code, ref_year)
+);
+
+WITH raw AS (
+  SELECT
+    raw_json,
+    filename
+  FROM read_json(
+    @LANDING_DIR || '/eurostat/*/*/urb_cpop1.json.gz',
+    format = 'auto',
+    filename = true,
+    columns = { 'raw_json': 'JSON' }
+  )
+),
+-- Unnest city codes with their ordinal positions
+cities AS (
+  SELECT
+    city_code,
+    (city_pos)::INTEGER AS city_pos,
+    filename,
+    raw_json,
+    (json_extract(raw_json, '$.size[1]'))::INTEGER AS n_times
+  FROM raw,
+  LATERAL (
+    SELECT key AS city_code, value::INTEGER AS city_pos
+    FROM json_each(json_extract(raw_json, '$.dimension.cities.category.index'))
+  )
+),
+-- Unnest time (year) values with positions
+times AS (
+  SELECT key AS ref_year, value::INTEGER AS time_pos
+  FROM (SELECT raw_json FROM raw LIMIT 1),
+  LATERAL (
+    SELECT key, value
+    FROM json_each(json_extract(raw_json, '$.dimension.time.category.index'))
+  )
+)
+SELECT
+  c.city_code,
+  t.ref_year,
+  TRY_CAST(
+    json_extract(c.raw_json, '$.' || (c.city_pos * c.n_times + t.time_pos)::TEXT)
+    AS DOUBLE
+  )                       AS population,
+  c.filename              AS source_file,
+  CURRENT_DATE            AS extracted_date
+FROM cities c
+CROSS JOIN times t